CN102360852B - Heavy-current planar transformer - Google Patents
Heavy-current planar transformer Download PDFInfo
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- CN102360852B CN102360852B CN2011101745003A CN201110174500A CN102360852B CN 102360852 B CN102360852 B CN 102360852B CN 2011101745003 A CN2011101745003 A CN 2011101745003A CN 201110174500 A CN201110174500 A CN 201110174500A CN 102360852 B CN102360852 B CN 102360852B
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Abstract
The invention relates to a planar transformer, in particular to a heavy-current planar transformer manufactured on a multilayer printed circuit board (PCB). The heavy-current planar transformer disclosed by the invention comprises magnetic cores and coil windings. The invention relates to magnetic core shapes, a coil topological structure and a winding method of the planar transformer. The heavy-current planar transformer is characterized in that a primary winding is formed by connecting a large coil surrounding two magnetic cores and a small coil surrounding a magnetic core in series; a secondary winding is formed by connecting a plurality of coils in parallel; different windings are in circulating staggered arrangement on all layers of the PCB; and a signal winding and a power winding are wound on different magnetic core columns. The planar transformer has small size, low height and heavy current. The heavy-current planar transformer is generally integrated on the PCB of a switch power supply for being used as a power transmission transformer in the switch power supply.
Description
Technical field
The present invention relates to a kind of flat surface transformer, especially a kind of big electric current flat surface transformer that is produced on the printed circuit board (PCB) (PCB).
Background technology
Along with the development of Switching Power Supply, small size, high power density more and more are called pursue one's goal table and the developing direction of Switching Power Supply, and the various technology that reduce power volume, raising power density are arisen at the historic moment, and the flat surface transformer technology is exactly one.In the Switching Power Supply of conventional art, power transformer is realized by the many groups lead that is wrapped on the magnetic core.Such transformer occupies significant volume, make switch power module be difficult to do little, do thin.And because the gap ratio of coiling is bigger, the leakage inductance of transformer is also bigger, and degree of coupling is relatively poor, and transformer efficiency is lower.The appearance of flat surface transformer has reduced volume and the height of transformer greatly, thereby very is conducive to reduce volume and the height of power module, makes power module be able to miniaturization, complanation.Simultaneously, because the flat surface transformer compact conformation has increased the degree of coupling, reduced leakage field; Because reducing of core volume, the energy loss on the magnetic core also reduces, and these all are conducive to improve the efficient of transformer.Therefore, flat surface transformer has obtained extensive use in switch power module now.
Present big electric current, high-power planar transformer, mostly with copper sheet as former limit and secondary winding, a plurality of this windings are stacked and magnetic core constitutes transformer together.Two subject matters of flat surface transformer existence of this structure: the firstth, the insulation distance that safety requires is difficult the realization, especially the reinforced insulation that requires in the AC/DC converter safety implements comparatively complexity, often wants special skeleton to realize; The secondth, since the multilayer superposition, the structural manufacturing process complexity, and the processing difficulty is big.
Some are also arranged with the flat surface transformer of the lead on the PCB as winding, but these transformer major parts all are to be applied under little electric current, the low power situation, such as secondary power supply DC/DC converter.This moment is as the lead of Transformer Winding, the part of power module PCB normally, and specific practice is: the appropriate location at mainboard PCB forms the former limit of transformer and secondary winding, and has the hole corresponding to magnetic core, has just formed transformer after embedding magnetic core.The advantage of this structure is compact conformation, and the height of transformer is low, and is less to the whole height influence of converter.But because transformer itself namely is the part of PCB, must be subjected to thick etc. the restriction of the number of plies of PCB and copper, can't pass through big electric current, can only be applied to little electric current, low power occasion.
Therefore, how when reducing volume and height, make flat surface transformer can transmit bigger electric current and power is an important research direction.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of big electric current flat surface transformer is provided, be specifically related to the flat surface transformer solution of a kind of high efficiency, small size, low clearance, big electric current.The present invention generally is integrated on the pcb board of Switching Power Supply, as the power delivery transformer in the Switching Power Supply.
According to technical scheme provided by the invention, a kind of big electric current flat surface transformer comprises magnetic core and winding, and magnetic core has two, is installed on the pcb board, and core post is passed described pcb board, is divided into core post, following core post, and winding is formed by the conductive pattern on the pcb board; Winding comprises former limit winding, secondary power winding, secondary signal winding, it is characterized in that: described former limit winding is formed by two coils from parallel connection of coils, the some of them number of turn of these two coils is around the last core post of two magnetic cores, and other numbers of turn are around the last core post of one of them magnetic core; Secondary power winding has four groups, and every group only has the coils from parallel connection of coils of a circle to form by a plurality of, around the last core post of one of them magnetic core.
Whole numbers of turn of wherein two windings in some number of turn of one of them coil of former limit winding, the secondary power winding are around the last core post of a magnetic core, and whole numbers of turn of a winding in the secondary signal winding are around the following core post of this magnetic core; Whole numbers of turn of two other winding in some number of turn of another coil of former limit winding, the secondary power winding are around the last core post of another one magnetic core, and whole numbers of turn of another winding in the secondary signal winding are around the following core post of this magnetic core.
For two secondary power windings of the last core post that is centered around same magnetic core, the end of the same name of one of them winding links to each other with the non-same polarity of another winding.
Pcb board is multi-layer PCB board, is equipped with the hole that coincide with the core post shape on the pcb board; To placement, two magnetic cores laterally are arranged on the pcb board about magnetic core; Pcb board is divided into two parts by magnetic core in the vertical, and the part of former limit winding and secondary power winding one side is power circuit portion, and the part of signal winding one side is signal circuit section.
Described former limit winding, secondary power winding, secondary signal winding are separately positioned on the different PCB layers, and more than one deck of the PCB number of plies of comprising of each winding; The different winding coil circulations that are centered around same magnetic core are arranged alternately.
Described magnetic core is CI type magnetic core, and it comprises a part that the part of two core post, a bottom surface is arranged and have only a bottom surface.
Concrete, the magnetic core of described big electric current flat surface transformer comprises two first identical shaped magnetic cores and second magnetic core, described first magnetic core and second magnetic core include two core post and two bottom surfaces, two core post are vertical with two bottom surfaces, accompany multi-layer PCB board between two bottom surfaces, two core post are passed the through hole on the multi-layer PCB board respectively; Place about described first magnetic core and second magnetic core, core post is transversely arranged, and the last core post of first magnetic core and the last core post of second magnetic core are positioned at a horizontally-arranged, and the following core post of first magnetic core and the following core post of second magnetic core are positioned at a horizontally-arranged.
Described winding is the coil that is printed on the multi-layer PCB board, and described winding comprises former limit winding and secondary power winding.Former limit winding is made up of two coils, and these two coils some numbers of turn wherein are simultaneously around the last core post of first magnetic core and second magnetic core, and other numbers of turn are around the last core post of first magnetic core or second magnetic core.Two coils must be in parallel when using.Secondary power winding has four groups, comprises the first secondary power winding, the second secondary power winding, the 3rd secondary power winding and fourth officer limit power winding.The first secondary power winding and the second secondary power winding are around the last core post of first magnetic core, and the 3rd secondary power winding and fourth officer limit power winding are around the last core post of second magnetic core.The two ends of the first secondary power winding, the second secondary power winding, the 3rd secondary power winding and fourth officer limit power winding are first end and second end, and first end of these four windings is end of the same name each other.Second end of first end of second end of the first secondary power winding, the second secondary power winding, the 3rd secondary power winding connects together with first end of fourth officer limit power winding.
The coil of described winding is separately positioned on the different layer of multi-layer PCB board, the more than one deck of the number of plies that each winding comprises, and the coil of different windings is staggered at each layer of multi-layer PCB board.
Every group of secondary power winding only has the coils from parallel connection of coils of a circle to form by a plurality of.
Described winding also comprises secondary signal winding, and secondary signal winding is looped around the following core post of first magnetic core or the following core post of second magnetic core.
Beneficial effect of the present invention is: (1) has adopted conducting metal pattern on the PCB of multilayer as former limit and secondary winding, directly embeds magnetic core and forms power transformer, has dwindled the volume of transformer greatly, has alleviated transformer weight.(2) the secondary winding is formed by a plurality of coils from parallel connection of coils, has increased the through-current capability of transformer greatly, makes transformer can bear bigger electric current.(3) the power winding is wrapped in respectively on the different core post with the signal winding, and the power circuit portion on the pcb board and signal circuit section are kept apart, and has avoided the phase mutual interference.
Description of drawings
Fig. 1 is circuit diagram of the present invention and the application schematic diagram of the present invention in the full bridge rectifier of LLC resonant type soft-switch;
Fig. 2 is pcb board figure of the present invention;
Fig. 3 is the schematic diagram of magnetic core of the present invention and winding.
Embodiment
Below in conjunction with accompanying drawing, according to specific embodiment the present invention is further elaborated.In this example, the present invention is applied in the resonant type soft-switch full-bridge rectification output in the power module, as shown in Figure 1.The present invention includes magnetic core and coil windings.Magnetic core has two, and the circuit on the pcb board is divided into two parts up and down, is power circuit portion above, is signal circuit section below, as shown in Figure 2.For convenient statement, each winding of Fig. 1 is called first coil 1, second coil, 2, the first secondary power windings 3, the second secondary power winding 4, the 3rd secondary power winding 5, fourth officer limit power winding 6, the first signal winding 7, secondary signal winding 8 by mark.
As shown in Figure 1, coil windings comprises: one group of former limit winding, and it is composed in parallel in resonant circuit by two first, second coils 1,2, and each coil has comprised some circle coilings, and the sense of current of bridging coil must be identical; The first secondary power winding 3, the second secondary power winding 4, the 3rd secondary power winding 5, fourth officer limit power winding 6, each group all only is made up of the coils from parallel connection of coils of circle coiling by many.The winding of these former limits and secondary is wrapped on the last core post of two magnetic cores.The mode of the coiling of former limit winding is big ringlet combination, by the configuration of great circle and ringlet, makes the excitation of first coil 1 and second coil 2 all be delivered to all windings of secondary, but this transmission has again and stresses.Coil is many around a ringlet on which magnetic core, and the excitation in the coil just is delivered on the secondary power winding of this magnetic core more.In this example, coil 1 just is made up of two great circles and a ringlet that is wrapped in first magnetic core 10, and second coil 2 just is made up of two great circles and a ringlet that is wrapped in second magnetic core 11.Wherein the ringlet of first coil 1, the first secondary power winding 3, the 3rd secondary power winding 5, the first signal winding 7 are wrapped on the last core post of first magnetic core 10; The ringlet of second coil 2, the second secondary power winding 4, fourth officer limit power winding 6, secondary signal winding 8 are wrapped on the last core post of second magnetic core 11; The great circle of first coil 1, second coil 2 is wrapped on the last core post of two magnetic cores.
Secondary power winding has four, they are the first secondary power winding 3, the second secondary power winding 4, the 3rd secondary power winding 5, fourth officer limit power winding 6, wherein the non-same polarity of the end of the same name of two windings and two other winding links to each other in twos, the i.e. end of the same name of the first secondary power winding 3, the end of the same name of the 3rd secondary power winding 5, the non-same polarity of the 3rd secondary power winding 4, the non-same polarity of fourth officer limit power winding 6 link a little 9 jointly, see Fig. 1.In application shown in Figure 1, point 9 is received the anode of output, and the first secondary power winding 3, the second secondary power winding 4, the 3rd secondary power winding 5, fourth officer limit power winding 6 other four terminals are linked the output negative terminal by first, second, third, fourth 4 switches 16,17,18,19 respectively.First switch 16 and the 3rd switch 18 are one group, and second switch 17 and the 4th switch 19 are other one group, and during one group of switch closure, another group switch disconnects.The direction that detours of the first secondary power winding 3, the second secondary power winding 4 and the 3rd secondary power winding 5, fourth officer limit power winding 6 is opposite.The coil of secondary winding all is ringlet, and the number of turns is a circle in this example.Each winding can be made up of a plurality of coils from parallel connection of coils, to increase through-current capability.For example in this example, the first secondary power winding 3, the 3rd secondary power winding 5 are made up of 4 coils from parallel connection of coils, and the second secondary power winding 4, fourth officer limit power winding 6 are made up of 3 coils from parallel connection of coils.
The winding of above-mentioned these former limits and secondary all is the power winding, and they are wrapped on the last core post of two magnetic cores.The winding method of every circle coiling has two kinds of great circle and ringlets, and as shown in Figure 3, the loop of ringlet is around the last core post of one of them magnetic core; The loop of great circle centers on the last core post of two magnetic cores simultaneously.The canoe of former limit winding is big ringlet combination, and some numbers of turn adopt the great circle mode to twine in some circle coilings of each former limit winding, and other numbers of turn adopt the ringlet mode to twine; Each coil of each group of secondary power winding all is that the ringlet mode is twined.Except the winding of these through-put powers of mentioning above, also comprise the first signal winding 7, secondary signal winding 8, be wrapped on the following core post of two magnetic cores, their effect is to power to signal circuit section.Winding of different nature is staggered in each layer cocycle of pcb board, and namely certain one deck belongs to the winding coil of certain character, and following one deck must belong to another, and the winding coil of various character is arranged circularly.
The magnetic core that adopts among the present invention is CI type magnetic core, and is bonding by the magnetic core glue of special use.Each magnetic core comprises a part that the part of two core post and a bottom surface is arranged and have only a bottom surface, and the bottom surface of these two parts is round rectangle, and the cross section of core post is that two ends are the strip of round end.Coil windings is formed by the conductive coil of each layer on the multi-layer PCB board.
Implementation of the present invention is: on the pcb board 15 of a multilayer, stamp the hole 20 that coincide with the core post shape, print the metal pattern of conductive coil at each layer of pcb board 15 around hole 20, the place that needs to connect connects by via hole, embed core post in the middle of the hole, the conductive coil that makes each layer on the pcb board 15 is coupled together by the magnetic core of closure.
Fig. 3 has represented the shape of magnetic core of the present invention.The present invention adopts is CI magnetic core in the insert plate, and do not have to adopt the EI magnetic core integrally cover on the plank, because volume is less like this, and conveniently power section and the signal section of circuit on the plate are kept apart, avoid producing and disturb, especially avoid the bigger power section of voltage and current to the interference of signal section, made signal circuit energy operate as normal, produced correct control signal.Fig. 3 has also represented to have great circle and two kinds of canoes of ringlet.Coil 12 and 13 among ringlet such as Fig. 3; Coil 14 among great circle such as Fig. 3.
Fig. 2 has represented the shape of pcb board of the present invention.Two magnetic cores of the present invention, first magnetic core 10 and second magnetic core 11, about to placement, laterally be arranged on the pcb board 15.Core post is transversely arranged, and the last core post of the last core post of first magnetic core 10 and second magnetic core 11 is positioned at a horizontally-arranged, and the following core post of the following core post of first magnetic core 10 and second magnetic core 11 is positioned at a horizontally-arranged.Pcb board 15 the first half are power circuits, and the latter half is signal circuit.The winding of through-put power is all on top core post, and the winding of transmission signal just is wrapped on the following core post.
Magnetic core can use the manganese-zinc ferrite manufacturing, also can be according to the specific requirement of indexs such as magnetic permeability, saturation flux density by the other materials manufacturing.Magnetic core sticking and locate to leave certain air gap.Can determine bonding tightness degree according to the former limit of the required transformer of circuit and secondary inductance value.
The pcb board that uses among the present invention is the pcb board of multilayer, and the concrete number of plies is determined by needs.The layer with the layer spacing than hour, leakage inductance is less but parasitic capacitance is bigger, insulating properties is also poor; When the spacing of layer and layer is big, good insulating, parasitic capacitance is little and leakage inductance is bigger, so must select interlamellar spacing (such as 100um) preferably.Because the electric current that bears is bigger, the thickness that covers copper on the plank is wanted enough (such as 100um), can not be too little; And owing to the caloric value of pcb board under the big electric current is bigger, preferably select the good or resistant to elevated temperatures pcb board material of thermal conductivity (such as high Tg170) for use.
The pattern of the conductive coil of each winding must center on the hole to be arranged, interconnected by via hole, forms closed loop.The pattern of conductive coil can be rectangle, as shown in Figure 3, also can be other shapes.Be used for the former limit winding of through-put power and each layer of secondary power winding conductive pattern want broadly similar, the width that covers copper must wideer (such as 70mil), could satisfy the needs that pass through big electric current like this.Only around the latter half of one of them magnetic core, its cabling can be thinner usually for secondary signal winding.
In order to reduce to disturb and ghost effect, the winding of various different in kinds circulation usually is staggered, and is far away to guarantee the distance that connatural winding is separated by.For example in this example, the great circle of first coil 1 is positioned at second, layer 6, and ringlet is at the tenth layer of wounded core 10; The great circle of second coil 2 is positioned at the 4th, eight layer, and ringlet is at the tenth layer of wounded core 11; The first secondary power winding 3, the 3rd secondary power winding 5 respectively around first, the 5th, the 9th, the magnetic core 10 of Floor 12 and the last core post of magnetic core 11; The second secondary power winding 4, fourth officer limit power winding 6 respectively around the 3rd, the 7th, the magnetic core 10 of eleventh floor and the last core post of magnetic core 11; The first signal winding 7, secondary signal winding 8 are respectively around the following core post of the 13 layer magnetic core 10 and magnetic core 11.
The turn ratio of flat surface transformer is set by the coil turn of setting former limit and secondary.For example in this example, by top narration as can be known, core post is around 5 weeks on each magnetic core for the electric current on former limit, and core post is around 1 week on each magnetic core for the total current in parallel of secondary, and turn ratio is 5:1.Also can set other turn ratio as required.
Transformer in this example, can regard a transformer of being formed by first magnetic core 10 and first coil 1, the first secondary power winding 3, the second secondary power winding 4, the first signal winding 7 as, another transformer of forming with second magnetic core 11, second coil 2, the 3rd secondary power winding 5, fourth officer limit power winding 6, series connection and the first secondary power winding 3, the second secondary power winding 4, the 3rd secondary power winding 5, the 3rd secondary power winding 6 by first coil 1 and second coil 2 are connected to a little flat surface transformers of 9 formations jointly.The first secondary power winding 3 and the second secondary power winding 4 can be considered as a winding, and the 3rd secondary power winding 5 and the 3rd secondary power winding 6 can be considered as a winding, and point 9 is centre caps.
By above-mentioned design, the flat surface transformer in this example has been realized the electric current output of 25A on the area of the size of two transversely arranged 30mm of each transformer 15mm * 6mm(* 6mm), and highly very little, less than 6.5mm.
Claims (4)
1. one kind big electric current flat surface transformer, comprise magnetic core and winding, it is characterized in that: described magnetic core comprises two identical shaped first magnetic cores (10) and second magnetic core (11), described first magnetic core (10) and second magnetic core (11) include two core post and two bottom surfaces, two core post are vertical with two bottom surfaces, accompany multi-layer PCB board (15) between two bottom surfaces, two core post are passed the through hole (20) on the multi-layer PCB board (15) respectively; Place about described first magnetic core (10) and second magnetic core (11), core post is transversely arranged, the last core post of the last core post of first magnetic core (10) and second magnetic core (11) is positioned at a horizontally-arranged, and the following core post of the following core post of first magnetic core (10) and second magnetic core (11) is positioned at a horizontally-arranged;
Described winding is for being printed on the coil on the multi-layer PCB board (15), and described winding comprises former limit winding and secondary power winding; Former limit winding is made up of two coils, these two coils some circles whiles wherein are around the last core post of first magnetic core (10) and second magnetic core (11), other circles are around the last core post of first magnetic core (10) or second magnetic core (11), and two coils must be in parallel when using; Secondary power winding has four groups, comprise the first secondary power winding (3), the second secondary power winding (4), the 3rd secondary power winding (5) and fourth officer limit power winding (6), wherein the first secondary power winding (3), the 3rd secondary power winding (5) are wrapped on the last core post of first magnetic core (10); The second secondary power winding (4), fourth officer limit power winding (6) are wrapped on the last core post of second magnetic core (11); The two ends of the first secondary power winding (3), the second secondary power winding (4), the 3rd secondary power winding (5) and fourth officer limit power winding (6) are respectively first end and second end, and first end of these four windings is end of the same name each other; Second end of first end of second end of the first secondary power winding (3), the second secondary power winding (4), the 3rd secondary power winding (5) connects together with first end of fourth officer limit power winding (6).
2. big electric current flat surface transformer according to claim 1, the coil that it is characterized in that winding is separately positioned on the different layer of multi-layer PCB board (15), the more than one deck of the number of plies that each winding comprises, the coil of different windings is staggered at each layer of multi-layer PCB board (15).
3. big electric current flat surface transformer according to claim 1 is characterized in that every group of secondary power winding only has the coils from parallel connection of coils of a circle to form by a plurality of.
4. big electric current flat surface transformer according to claim 1 is characterized in that described winding also comprises secondary signal winding, and secondary signal winding is looped around the following core post of first magnetic core (10) or the following core post of second magnetic core (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101745003A CN102360852B (en) | 2011-06-25 | 2011-06-25 | Heavy-current planar transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101745003A CN102360852B (en) | 2011-06-25 | 2011-06-25 | Heavy-current planar transformer |
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| CN102360852A CN102360852A (en) | 2012-02-22 |
| CN102360852B true CN102360852B (en) | 2013-09-18 |
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| CN2011101745003A Active CN102360852B (en) | 2011-06-25 | 2011-06-25 | Heavy-current planar transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017144848A1 (en) * | 2016-02-24 | 2017-08-31 | Cooper Technologies Company | Pcb transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6227446B2 (en) * | 2014-03-12 | 2017-11-08 | 日立オートモティブシステムズ株式会社 | Transformer and power converter using the same |
| CN107437456B (en) | 2016-05-25 | 2021-03-23 | 台达电子企业管理（上海）有限公司 | Magnetic core structure and magnetic element |
| CN107273563B (en) * | 2017-04-24 | 2020-08-25 | 东南大学 | Equivalent calculation method for parasitic capacitance of PCB winding of planar transformer |
| CN111145988B (en) | 2018-11-02 | 2021-12-07 | 台达电子企业管理（上海）有限公司 | Transformer module and power module |
| US12002615B2 (en) | 2018-11-02 | 2024-06-04 | Delta Electronics (Shanghai) Co., Ltd. | Magnetic element, manufacturing method of magnetic element, and power module |
| CN111145987B (en) * | 2018-11-02 | 2021-07-06 | 台达电子企业管理（上海）有限公司 | Transformer module and power module |
| CN115359999A (en) | 2018-11-02 | 2022-11-18 | 台达电子企业管理（上海）有限公司 | Transformer module and power module |
| CN114270458B (en) * | 2020-07-06 | 2024-07-05 | 华为数字能源技术有限公司 | Matrix transformer, power converter and arrangement method of matrix transformer windings |
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| GB2252208A (en) * | 1991-01-24 | 1992-07-29 | Burr Brown Corp | Hybrid integrated circuit planar transformer |
| CN1748267A (en) * | 2003-02-04 | 2006-03-15 | 雷声公司 | Electrical transformer |
| CN101009154A (en) * | 2006-02-20 | 2007-08-01 | 艾默龙电子科技（嘉兴）有限公司 | A high-density and high current transformer structure |
| CN202102869U (en) * | 2011-06-25 | 2012-01-04 | 中国电子科技集团公司第五十八研究所 | Large-current plane transformer |
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|---|---|---|---|---|
| GB2252208A (en) * | 1991-01-24 | 1992-07-29 | Burr Brown Corp | Hybrid integrated circuit planar transformer |
| CN1748267A (en) * | 2003-02-04 | 2006-03-15 | 雷声公司 | Electrical transformer |
| CN101009154A (en) * | 2006-02-20 | 2007-08-01 | 艾默龙电子科技（嘉兴）有限公司 | A high-density and high current transformer structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017144848A1 (en) * | 2016-02-24 | 2017-08-31 | Cooper Technologies Company | Pcb transformer |
| RU2735326C2 (en) * | 2016-02-24 | 2020-10-30 | Итон Интеллиджент Пауэр Лимитед | Transformer with printed circuit board |
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| CN102360852A (en) | 2012-02-22 |
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